Interface Passport
Origin A · Passport Studio

Proof of capability · Profile source

Bring what helps.
Leave the explanation behind.

Your passport contains functional interface preferences—not a diagnosis, identity, or reason. Your agent can carry only settings that the current site's own tools support with the same meaning.

My interaction profile

What makes an interface easier?

Stored on this device
Information density

Choose how much supporting information appears at once.

Control size

Sites can increase the space around buttons and inputs.

Motion

Reduce nonessential transitions and animated movement.

Color scheme

Use a light, dark, or system-matched interface when a site exposes that exact choice. Migrated profiles share no color choice until you select one.

How the task works

These have no browser or operating-system equivalent. A site that supports them changes the shape of the work, not its appearance.

Step chunking

Present a long task all at once, or one step at a time with progress.

Explanations

Add plain-language help to each field explaining why it is asked and what is accepted.

Error recovery

When something is wrong, say what to do next and show the expected shape, instead of only saying it is invalid.

Visible evidence

Tool activity

  1. No tool calls yet. Manual edits stay local.

Return records · verified here

Where your passport has been

WebMCP tools live and die with one document, so nothing travels between origins except your agent's own context. A destination can export a return record of what it did with your preferences; the agent carries it here; this page re-derives the record's own arithmetic and compares it with what this passport actually disclosed. The verdict is computed here. No argument can assert it.

Nine checks. Seven are decided from the record alone, so they catch tampering and mistakes—not a wholly invented record. Two are decided from what only this passport knows. Nothing here proves a human approved anything, and nothing here proves a record came from the origin it names: a page cannot authenticate a cross-origin claim without a shared secret. The audit document says so in its own last section.

Filed records

    Independent-site compatibility check

    A real schema check—not another Interface Passport demo

    Direct browser discovery on Kasper Kulikowski's independently operated site found a page-owned set_theme WebMCP tool whose light, dark, and system values exactly match this passport's color-scheme field. The agent must re-check that live schema on every visit; the other passport fields stay unshared there. Interface Passport is not affiliated with or endorsed by that site or its owner.

    Live schema checked 31 Aug 2026 Color scheme: exact match Density, control size, motion: unsupported Open independent live site